Production is likely to reach 259 million hectolitres - a decrease of 5 per cent compared with 2015 - which ranks among the three poorest years since 2000, according to the OIV's early estimates revealed at a Paris press conference.
But it said country production figures were "highly contrasting" and blamed the topsy-turvy picture on "climatic events".
Italy confirmed its place as the leading world producer with 48.8 hectolitres, having knocked France off the top spot in 2015.
Of the top three producing nations, the OIV expects only Spain to show growth in 2016, with a one-percent year-on-year rise to 37.8 million hectolitres.
The United States is fourth with 22.5 million hectolitres, a rise of 2 per cent, and Australia is the world's fifth-largest producer after seeing 5 per cent growth to 12.5 million hectolitres.
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